| Value | Category | Cases | |
|---|---|---|---|
| 2004 | 198 |
24.3%
|
|
| 2005 | 271 |
33.3%
|
|
| 2006 | 231 |
28.4%
|
|
| 2007 | 78 |
9.6%
|
|
| 2008 | 16 |
2%
|
|
| 9997 | Inconsistent | 20 |
2.5%
|
| 9998 | DK | 0 |
0%
|
| Sysmiss | 7630 |